/* -*- coding: utf-8 -*-
 *
 * 49.cc: No.49 算数の宿題 - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

/* typedef */

/* global variables */

/* subroutines */

int num(string &s, int &pos) {
  int n = 0;
  while (pos < s.size() && s[pos] >= '0' && s[pos] <= '9')
    n = n * 10 + s[pos++] - '0';
  return n;
}

/* main */

int main() {
  string s;
  cin >> s;

  int pos = 0;

  int n0 = num(s, pos);
  while (pos < s.size()) {
    char op = s[pos++];
    int n1 = num(s, pos);
    n0 = (op == '*') ? n0 + n1 : n0 * n1;
  }

  printf("%d\n", n0);
  return 0;
}